[macstl-dev] macstl for gcc 4.0 on Tiger

[Glen Low]

Hi All

I've just committed a change for macstl (0.2.2.16) to our Subversion  
servers which enables macstl for Apple gcc 4.0 on Mac OS X 10.4 aka  
Tiger.

Here are some preliminary benchmark results, if you're interested:

Benching multiply add:  2000000/sec  3.4*std  3.4*raw.
Benching inner product:  1000000/sec  3*std  3*raw.
Benching polynomial:  833333/sec  3.58333*std  3.41667*raw.
Benching hypotenuse:  322580/sec  3.45161*std  3.64516*raw.
Benching complex multiply add:  344827/sec  2.2069*std  2.34483*raw.
Benching predicate:  1250000/sec  13.375*std  1.875*raw.
Benching slicing:  222222/sec  0.733333*std  0.8*raw.
Benching power:  49751/sec  7.12935*std  7.12438*raw.
Benching trigonometric:  71942/sec  22.1439*std  22.0288*raw.

The nice thing is that the trig results are now comparable to CW 9.3  
and inner product and polynomial seems a little faster. Changed the  
casts over to use Motorola-style C syntax which cured the ICE's that  
gcc 4.0 gets, and moved the data () member function over to vec from  
vec_base, which fixed a large part of the slowdowns. Also tweaked the  
inlining options a little more and the benchmark suite so that gcc  
4.0 doesn't over-eagerly shift code around and kill my timers.

Curiously enough, I enabled the long-awaited and fabled  
autovectorization feature in gcc 4.0 -- -ftree-vectorization -- and  
didn't see any budge in the above figures. Go figure. Perhaps one of  
you can enlighten me what I did wrong there.

It's not yet a release version -- I hope to get some other changes in  
place (including SkyComputer's support for YDL) and test reversions  
on the other compilers -- hopefully it should be released around time  
of the WWDC (a week more).

If you're dying to try it out right away, well -- [shameless plug  
ahead] individual, corporate or redistributable licensees have  
Subversion checkout rights (1, 2 or 3 years from date of payment --  
see http://www.pixelglow.com/macstl/purchase/) on the trunk and you  
can even spin off your own version in the branches. You know what to  
do :-)

Cheers, Glen Low


---
pixelglow software | simply brilliant stuff
www.pixelglow.com
aim: pixglen

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